JP3621836B2 - Wire machine for paper machine former - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wire cleaning device for a paper machine former that can obtain high cleaning efficiency and prevent mist from scattering.
[0002]
[Prior art]
FIG. 3 shows one form of a paper machine former part, and FIG. 4 shows details of a wire cleaning apparatus using a high-pressure water jet that is often used conventionally.
In FIG. 3, the paper raw material liquid 2 ejected from the head box 1 is supplied between the top wire 3 and the bottom wire 4 guided by the forming roll 10 and the breast roll 11. This paper raw material liquid 2 is sandwiched in a gap formed by two wires 3, 4 of the top wire 3 and the bottom wire 4, and is sent at substantially the same speed as the top wire 3 and the bottom wire 4. While the distance between the top wire 3 and the bottom wire 4 is narrowed, a paper raw material is produced by a first dehydrating device 5 provided in the loop of the bottom wire 4 and a second dehydrating device 6 provided in the loop of the top wire 3. The liquid 2 is dehydrated, and a fiber mat is gradually formed.
Further, dehydration is performed by the third dehydrating device 7 provided in the loop of the bottom wire 4 to form a final paper layer.
[0003]
The paper layer thus formed passes through the couch roll 8 and is securely transferred to the bottom wire 4 by the transfer box 9, and then transferred to the press part of the next process by a suction pickup roll (not shown). Is done.
Each of the top wire 3 and the bottom wire 4 is endless, and is continuously used by changing its direction with a return roll 12 and a wire turning roll 13.
[0004]
Among these processes, in the dehydration process, when the wires 3 and 4 pass, the paper raw material liquid is entangled in the mesh of the wires 3 and 4, and the place where the wires 3 and 4 are separated from the web, on the transfer box 9, Paper dust on the surface of the paper web adhered to the wire 3 and contaminated the wire. Therefore, high-pressure water jet type wire cleaning devices 14 and 15 are installed on the respective wires 3 and 4 in order to remove dirt entangled or adhered to the meshes of these wires 3 and 4.
[0005]
A detailed view of the cleaning apparatus will be described with reference to FIG.
A plurality of high-pressure water jet nozzles 19 are attached to a boss portion having a screw hole penetrating the water conduit 17 at a predetermined pitch in the width direction of the paper machine.
In this cleaning device, high-pressure water supplied to the conduit 17 is ejected from the high-pressure water jet nozzle 19 as a needle-shaped high-pressure water jet 20 in order to clean the wires 3 and 4 soiled with paper powder.
Further, in order to clean the entire width direction of the wire 3 with the high-pressure water jet nozzle 19, the conduit 17 to which the high-pressure water jet nozzle 19 is attached is slid. On the other hand, the high-pressure water jet 20 that has passed through the wires 3 and 4 is sucked by a sabor or a suction box 21 as shown, and discharged to the outside through a drain pipe.
In this way, the dirt on the wires 3 and 4 was washed with paper dust.
[0006]
The installation location of the high-pressure water jet nozzle 19 is such that the high-pressure water jet 20 is sprayed on the wire 3 on the free run as shown by reference numeral 14 in FIG. As indicated by reference numeral 15, a high-pressure water jet nozzle 19 is provided so as to inject toward the wire 4 on the roll. When the high-pressure water jet 20 is ejected on the latter roll, the high-pressure water jet 20 that has passed through the wire 4 is reflected again to the water jet side, so that reciprocal cleaning is performed, and the cleaning efficiency can be increased. There was also the fault that generation | occurrence | production would increase.
[0007]
[Problems to be solved by the invention]
In the conventional wire cleaning apparatus using a high-pressure water jet, since the wires 3 and 4 are locally cleaned by the high-pressure water jet 20, the cleaning efficiency is low. Further, although the high-pressure water jet 20 is slid and washed, it is mechanically slid, so that the residence time is longer than the other parts at the turning point, and in extreme cases, the wires 3 and 4 are There was a problem of deformation. Furthermore, the splash of water that has collided with the wires 3 and 4 traveling by the needle-shaped high-pressure water jet 20 ejected from the high-pressure water jet nozzle 19 and passed through the wires 3 and 4 can be easily recovered with a sayball or a suction box. The mist generated by reflection on the surfaces of the wires 3 and 4 cannot completely cover the generated part, so the atmosphere of the machine and the peripheral part is moistened, and the fibers and fillers contained in the mist are scattered, These paper stocks are stagnant around the periphery.
When these stagnant material jumps on the wires 3 and 4, problems such as paper breakage and damaged paper occur, which is a serious problem in the operation of a paper machine that operates continuously.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a wire washing device for a paper machine former that can obtain high washing efficiency and prevent mist from scattering.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention supplies a paper raw material liquid between mesh-like wires that are formed in a loop and are driven to rotate, and dehydrates the paper raw material liquid between the wires to form a paper layer. In the wire cleaning device of a paper machine former, a cleaning water supply means for supplying cleaning water toward the wire and a downstream side of the cleaning water supply means are provided, and the cleaning water is pressed toward the wire to press the wire. A blade that forms a thin water film in the width direction and replaces a dirt substance in the wire, and a pressurized air injection unit that is provided on the downstream side of the blade and that injects pressurized air from the slit toward the wire And provided around the outlet of the slit of the pressurized air injection part, forming a gap between the outlet of the slit of the pressurized air injection part and the wire, and from the slit of the pressurized air injection part Of pressurized air to be injected And a mist scattering prevention walls forming a closed space over the circumference, the said blade, lies in the formation of the inclined surface portion of the angle of the taper of the conveyance direction of the wire.
[0010]
The present invention relates to a wire cleaning device for a paper machine, in which a cleaning water is supplied from a cleaning water supply box to a wire, and a wedge-shaped taper is formed on the downstream side of the cleaning water supply box toward a wire conveying direction. A fixed blade is provided and the washing water is pushed into the wire. Further, in order to remove the washing water pushed into the wire on the downstream side, pressurized air is jetted in a slit shape. A mist scattering prevention wall is provided at a location in contact with the wire of the pressurized air injection unit to prevent the mist from scattering.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a conceptual cross-sectional view showing a wire cleaning device for a paper machine former according to the present invention.
[0012]
In FIG. 1, reference numeral 50 denotes a wire such as a top wire or a bottom wire that dehydrates a paper raw material liquid to form a paper layer in a paper machine. A is a wire cleaning device installed in the middle of the wire 50.
[0013]
The paper machine wire cleaning apparatus A of the present invention includes a cleaning water supply box 51 as a cleaning water supply means for supplying cleaning water and a wire 50 for pushing the cleaning water into the wire 50 traveling downstream thereof. The wedge-shaped fixed blade 52 that forms a sloped portion 52a having a tapered angle toward the conveying direction and the cleaning water pushed into the wire 50 further downstream are removed by jetting pressurized air into a slit shape. It is comprised by the pressurized air injection part 53 as a pressurized air injection means, and the mist scattering prevention wall 54 provided in the location which contact | connects the wire 50 of the pressurized air injection part 53. FIG.
[0014]
That is, the cleaning water supplied to the cleaning water supply box 51 flows through the slit-shaped opening 56 provided in a part of the box, and along the inclined surface 52a of the wedge-shaped fixed blade 52 in the width direction. It reaches a traveling wire 50 in a flow that uniformly forms a water film.
The washing water flowing out of the traveling wire 50 is pushed into the traveling wire 50 by the wedge pressure generated between the inclined surface 52a of the wedge-shaped fixed blade 52 and the traveling wire 50.
The pushed washing water enters the gaps in the wire 50 and dilutes dirt substances (fibers, fillers, etc.) contained in the traveling wire 50.
The wire 50 containing cleaning water is jetted into the wire 50 from a slit 55 having a uniform slit width in the width direction connected to a pressurized air source (not shown) installed downstream thereof.
There is a gap (δ) between the outlet 55a of the slit 55 and the traveling wire 50, and the clogging of the outlet 55a of the slit 55 due to contact is prevented.
[0015]
However, if the gap (δ) is provided here, there is a problem that the air colliding with the wire 50 from the slit 55 does not pass through the wire 50 in a full amount and is scattered in a mist form.
In order to prevent this, a mist scattering prevention wall 54 is provided around the outlet 55a of the slit 55, and a closed space 57 for preventing mist scattering having a gap (δ) between the outlet 55a of the slit 55 and the wire 50. It is said. The closed space 57 uses the rear surface 52 b of the wedge-shaped fixed blade 52 as a part of the mist scattering prevention wall 54. In this way, generation of mist and scattering are prevented by suppressing the generated mist and forming water droplets by contact with the wall surface.
[0016]
According to the wire cleaning device of the paper machine former according to the present invention, the following effects can be obtained.
The wire cleaning device of the present application forms a uniform water film in the entire width direction of the wire 50, and pushes and fills the wire 50 with a wedge-shaped fixed blade 52 installed on the downstream side thereof. After diluting a substance (fiber, filler, etc.), pressurized air is ejected from the slit 55 to remove moisture in the wire 50.
Dirt substances in the wire 50 are cleaned and removed by diluting and replacing with clean cleaning water, and the traveling wire 50 is cleaned, and high cleaning efficiency is obtained.
Here, if a gap is provided between the outlet 55a of the slit 55 and the wire 50, a large amount of mist is generated.
On the other hand, when it is in contact, pressurized air is blown out during operation, but when the machine stops, the supply of pressurized air is stopped. Couldn't, and consumed a lot of pressurized air.
Therefore, in the present application, in order to suppress the generation of mist and at the same time reduce the air consumption, a clearance (δ) is provided between the outlet 55a of the slit 55 and the wire 50, and the mist scattering prevention wall 54 of the closed space 57 is provided. As a result, the above problems could be solved.
[0017]
The cleaning water supplied to the cleaning water supply box 51 flows through the slit-shaped opening 56 provided in a part of the box, and is uniform in the width direction along the inclined surface 52 a of the wedge-shaped fixed blade 52. However, a through hole 61 communicating with the opening 56 is formed in the wall surface 60 of the apparatus main body 59, and the wall surface 60 extends from the through hole 61. And the front surface of the wedge-shaped fixed blade 52 may be supplied to the slope portion 52a through a gap 62.
[0018]
In order to form the closed space 57 for preventing mist scattering, the rear surface 52b of the wedge-shaped fixed blade 52 as shown in FIG. 1 may be used together, or a flexible material may be used. Further, as shown in FIG. 2, a mist scattering prevention wall 54 may be provided on the entire circumference of the outlet 55 a of the slit 55 so as to be independent of the wedge-shaped fixed blade 52.
The wedge-shaped fixed blade 52 is provided with a T-shaped dovetail 58 and can be easily inserted and removed in the machine width direction. Further, the wedge angle and wear resistance can be taken into consideration depending on the traveling speed of the wire 50, the amount of washing water, and the like.
[0019]
【The invention's effect】
As described above, according to the wire machine for the paper machine former according to the present invention, the following effects can be obtained.
In a wire washing apparatus for a paper machine former that supplies a paper raw material liquid between mesh-like wires that are formed in a loop and are driven to rotate, and dehydrates the paper raw material liquid between the wires to form a paper layer. A cleaning water supply unit that supplies cleaning water toward the wire, and a downstream side of the cleaning water supply unit, and presses the cleaning water toward the wire to form a thin water film in the width direction of the wire. , blades and, provided downstream of the blade, and a compressed air injector for injecting pressurized air from the slit toward the wire, pressurized air ejection portion of the slit to replace the soiled material in the wire Provided between the outlet of the slit of the pressurized air injection unit and the wire and covers the periphery of the pressurized air injected from the slit of the pressurized air injection unit. Mistakes that form a closed space The blade is provided with a scattering prevention wall, and the blade is formed with a sloped portion having a taper angle toward the wire conveyance direction, so that dirt in the wire is washed by diluting and replacing with clean washing water. -The removed and traveling wire is cleaned, and high cleaning efficiency is obtained. In addition, a mist that forms a gap between the outlet of the slit of the pressurized air ejecting unit and the wire and that forms a closed space around the pressurized air ejected from the slit of the pressurized air ejecting unit. Since the anti-scattering wall is provided, dirt substances are not easily clogged, and mist generation and scattering can be prevented.
In addition, after forming a uniform water film across the entire width direction of the wire and pushing it into the wire with a blade installed downstream thereof to dilute dirt substances (fibers, fillers, etc.) entrained in the wire, Pressurized air can be injected to remove moisture in the wire.
Thus, the dirt substance in the wire is cleaned and removed by diluting and replacing with clean cleaning water, and the traveling wire is cleaned, and high cleaning efficiency is obtained.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a wire cleaning device for a paper machine former according to the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of a wire washing device for a paper machine former according to the present invention.
FIG. 3 is a perspective view showing one form of a paper machine former part.
FIG. 4 is a conceptual diagram showing details of a wire cleaning apparatus using a high-pressure water jet that is often used conventionally.
FIG. 5 is a conceptual diagram showing details of a conventional wire cleaning apparatus using a high-pressure water jet.
[Explanation of symbols]
50 Wire 51 Washing water supply box (cleaning water supply means)
52 Fixed blade 53 Pressurized air injection part 54 Mist scattering prevention wall 55 Slit 56 Opening part 57 Closed space 58 Dovetail groove 59 Device main body 60 Wall surface 61 Through hole 62 Gap

Claims (1)

In a wire washing apparatus for a paper machine former that supplies a paper raw material liquid between mesh-shaped wires that are formed in a loop and are driven to rotate, and dehydrates the paper raw material liquid between the wires to form a paper layer. A cleaning water supply means for supplying cleaning water toward the wire and a downstream side of the cleaning water supply means, and presses the cleaning water toward the wire to form a thin water film in the width direction of the wire. , blades and, provided downstream of the blade, and a compressed air injector for injecting pressurized air from the slit toward the wire, pressurized air ejection portion of the slit to replace the soiled material in the wire Provided between the outlet of the slit of the pressurized air injection unit and the wire and covers the periphery of the pressurized air injected from the slit of the pressurized air injection unit. Mistakes that form a closed space And a scattering prevention wall, the said blade, a paper machine former wire cleaning device, characterized in that the formation of the inclined surface portion of the angle of the taper of the conveyance direction of the wire.

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